Quota Sampling is where the population is split into predefined groups and sample sizes are based on a pre-specified proportion. Quota sampling is more cost-effective than random sampling if the random response rates are less than 50%. Quota sampling is also used when no sampling frame is available. So for instance with online surveys, since there is no sample frame for the online population, quotas provide for a balanced sample profile. A well-crafted quota can reduce bias by achieving a well spread sample. The bias decreases with quotas that are set more finely; this however needs to be balanced with the resultant increase in data collection costs.
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